Industrial Equipment, Machinery & Capital Goods calculator

Machine BOM Cost Variance Calculator

Use this calculator to estimate BOM cost variance for machinery projects. It helps estimating, procurement, and engineering quantify the effect of price changes, substitutions, shortages, and released design updates.

What this calculator does

  • Estimate machine BOM cost variance from affected BOM lines, average cost variance, affected share, and fixed sourcing or engineering review cost.
  • Use it when purchased components, fabricated parts, drives, motors, controls, or supplier changes move actual cost away from the quoted BOM.
  • The result estimates total BOM cost variance for the selected scope.

Formula used

  • Variable machine BOM cost variance = affected BOM line count × average cost variance per BOM line × affected project share
  • Total machine BOM cost variance = variable machine BOM cost variance + fixed sourcing and engineering review cost

Inputs explained

  • Affected BOM line count: Count purchased components, fabricated parts, machined parts, controls items, motors, drives, sensors, or assemblies with cost variance.
  • Average cost variance per BOM line: Use current cost minus quoted cost, or the expected variance per affected BOM line.
  • Affected project share: Use the share of the project, machine family, or release impacted by the variance.
  • Fixed sourcing and engineering review cost: Include supplier negotiation, engineering substitution, drawing updates, requalification, and purchasing administration.

How to use the result

  • Use it to decide whether to reprice, negotiate suppliers, use alternates, or update standard costs.
  • It depends on current quotes, approved substitutions, design release status, and purchasing timing.

Common questions

  • What is the machine BOM cost variance calculator for? It estimates the cost variance between quoted and current machine BOM costs.
  • What information should I enter? Use affected BOM line count, average variance per line, affected share, and fixed review cost.
  • What does the result tell me? The result helps decide whether BOM changes require repricing or cost recovery.
  • When is the result only an estimate? It is only an estimate when supplier pricing, substitutions, release status, or purchasing timing changes.

Last reviewed 2026-05-12.